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Biotypes of Amaranthus retroflexus L ., A. hybridus L., A. bouchonii Thell. and Chenopodium album L. insensitive to atrazine were collected from maize monoculture where atrazine had been applied extensively. Atrazine-resistant biotypes of A. retroflexus and A. hybridus showed phenmedipham and lenacil co-resistance and atrazine-resistant biotype of C. album showed fenuron co-resistance. An atrazin-resistant biotype of A. bouchonii with co-resistance to diuron was not resistant to fenuron, lenacil and phenmedipham.doi:10.1515/znc-1989-1-220 fatcat:uyh7par4frdejkxpbogpnoguey